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scenes/main/EntityManager.cs

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+using Ecosystem.scenes.entities;
+using Godot;
+using Godot.Collections;
+
+namespace Ecosystem.scenes.main;
+
+public partial class EntityManager : Node
+{
+    private static readonly object _lock = new object();
+    private static EntityManager _instance;
+    public static EntityManager Instance
+    {
+        get
+        {
+            lock (_lock)
+            {
+                if (_instance == null)
+                    _instance = new EntityManager();
+                return _instance;
+            }
+        }
+    }
+    
+    private Dictionary<int, entities.BaseEntity>  _entities = new Dictionary<int, entities.BaseEntity>();
+    public Dictionary<int, entities.BaseEntity> Entities => _entities;
+    public void AddEntity(entities.BaseEntity entity) => _entities.Add(0, entity);
+}